Dumb-waiter lock



' Oct. 9, 1923. 1,470,541

J. E. PHILLIPS DUMB WAITER LOCK Filed March 25 1922 INVENTOR JWEP momma Patented Get. 9, 1923.

UNITED STATES JAMES EDWIN PHILLIPS, OIE NEW YORK, N.

DUMB-wArrnn Loox.

Applieation'filed March 25, 1922. Serial No. 546,806.

To (ZZZ whom it may concern:

Be it known that I, JAMES E. PHILLIPS, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York,have invented a new and Improved Dumb-VVaiter Lock, of which the following vided with, what may be termed, a keeper is a full, clear, and exact description.

This invention relates to looks and particularly to an improved lock specially adapted for the doors of dumb-waiters or doors operating in a similar manner and has for an object to provide a construction which may be easily operated tromthe inside but cannot be operated or forced from the outside.

Another object of the invention is. to pro vide an extremely simple but eflicient lock for a door which will take the place of an ordinary bolt and an ordinary look at the same time.

A further object of the invention is to provide a lock having a hinged member and associated parts so arranged that at a glance anyone may observe whether or not the lock is in a locked or unlocked position.

In the accompanying drawing- Figure 1 is a front view of part of a dumbwaiter structure showing a door and the lock embodying the invention applied thereto.

Figure 2 is an enlarged i'ragmentary View of the door shown in Figure 1 with the lock applied.

Figure 3 is a horizontal longitudinal sectional view through the lock and associated parts shown in Figure 2.

.Figure 4 is a transverse sectional view through Figure 2 approximately on line ,44. Figure 5 is a fragmentary sectional" view through Figure 4 on line 5-5, the same being on a reduced scale. i

Figure 6 is a fragmentary sectional view through Figure 4 on line 66, the same beinon a reduced scale.

frame and a door 3 hingedin place. In large cities it is not unusual for thieves or unauthorized persons to enter apartments through the dumb-waiter and {heretofore it has been more or less difficult to secure an eilicient lockfor the door 3 of the dumbwaiter without presenting a very expensive and complicated structure. 1 i

To overcome these difficulties, the lock shown in the accompanying drawing, has been provided which will eftectivelylock the door but which is extremely simple in construc-t-ion and which may be readily obw served so as to learn whether or not the same is in a locked or an unlocked position. As indicated in the drawing, the lock is pro knuckles. and provide in effect a hinged structure. The plate 6 is provided with a. slot 11 which merges into arc-shaped notches 12 and 13 whereby the circular boss 14 prothrough the locking plate 6 or at least project therein to a suflicient extent to cause the" face of the boss 14 to be flush with the face ofthe plate 6. The boss14 is provided with a number of depressions 15, there being four depressions shown (Fig. 5) though a greater or less number may be provided. These depressions are designed toreceive the end pin 16 which is rigidly secured in the knob 17.

This pin yieldingly locks the knob 17 infour positions as shown in the drawing though it might look the same in additional positions if a greater number of depressions 15 were provided.

' jecting from the keeper plate 4 may project i In order that the end of pin 16 may snap into these depressions and be readily removed therefrom, the knob 17 is resiliently pressed against the boss 14 and when the parts are in the position shown in Figure 1, resiliently press against the plate 6. The

knob 17 is preferably provided. with areshaped projections 18 and 19 sothat these projections with the body of the knob will i. cover the boss 14 continually. The knob,

eferring to the accompanying drawing; by numerals, 1 indicates a dumb-waiter structure which is provided with a. door,

however, is arranged to have overlapped shoulders 20 and 21 designed to engage the plate 6 when the parts are in the position shown in Figures 2 and 4. ,A large bore 22 the spring 26 positioned in bore 22- This spring bears against the annular shoulder 27 ell as against the head'25 so that there is a continuous pressure against the knob 17 to hold the same in contact with the boss 14 and resiliently hold the spring 26 in one of r the sockets or depressions 15.

When it is desired to unlock the device, theknob is grasped and moved from the po sition shown in Figure 2 until it is in registry with the slot 11 whereupon the plate 6 may be swung until it forms substantially an elongation of the plate 5. The door 3 may then be opened and closed as desired. When the knob 17 is turned as just described, the turning pressure and the rounded end of pin 16 will result in the handle 17'moving away from plate 6 and compressing spring 26 slightly. As soon as the ban dle is moved through an arc of ninety de-'- grees, pin 16 will automatically snap into the next notch 15 so that the knob will be held yieldingly locked in registry with the slot 11. The arrangement of the spring 26, pin 16 and associated parts is -to prevent the "knob 17 from accidentally shifting its position.

It will be noted, that by the construction set forth no one in the dumb-waiter or on the opposite side of the door 3"to that shown in the drawing could possibly move the knob 17. In addition, the construction of the lock automatically prevents anyone from forcing the door either outwardly or laterally as the platesG acting on the boss laact as meansfor connecting the edge of the door to the frame 2.

\Vhat I claim is 1. In a lock of the character described, a keeper plate adapted to be secured to a door, said keeper plate being provided with a boss extending from one face thereof, a locking plate hingedly secured to the 'jamb of said door, said locking plate being provided with an aperture for receiving said boss, and a slot extending therefrom, and a knob resiliently and movably mounted on said boss provided with a shoulder, said knob being movable to a position in line with said slot for permitting the lockingplate to be moved away from the'keeper plate and movable to a position with the shoulder overhanging the locking plate for locking together said locking plate and keeper plate.

2. A lock of the character described, comprising a fastener plate formed with a boss on one face, said boss'having a plurality of notches, a locking plate hingedly connected with a fixed support capable of'movement' so thatitwillenga'ge flatwise said keeper plate, said locking plate having an aperture through which said boss projects, and .a slot extending from said aperture, a rotatable knob mounted on and resiliently acting'against said boss and provided with a projection acting as a shoulder, said projection when in line with the slot permitting said clamping plate to be moved on and off said boss and when turned to a position out of registry with the slot locking the fastener plate against movement, and rigid means carried by said knob for yieldingly locking the same against movement.

3. In a lock of the character described, a locking plate having an opening therein, a keeper plate having a boss extending through said opening, said boss presenting depressions, a rotatable locking member carried by saidboss and adapted to be moved to a position overlapping said locking plate, said locking membe being resiliently held in contact with said boss, and a pin carried by said locking member for yieldingly holding the locking member in any adjusted position and engaging said depressions.

at. In a lock of the character described, a keeper plate having a boss extending therefrom provided with a-number of depressions, a locking plate having an opening for receiving said boss, a rotatable locking mem ber carried by said boss having a pair of shoulders adapted to be moved over said locking plate for locking the locking plate against said keeperplate, and means on the locking member coacting with said depressions for resiliently causing said locking member to engage said boss.

5. In a lock of the character described, a keeper plate, a swinging locking plate, said keeper plate having a boss projecting from one face thereof, said boss having depressions therein, said locking plate having an opening for receiving said boss and a pair of oppositely extending slots merging into said opening, a knob having a round portion fitting said boss and overhanging shoulders projecting from the round portion and formed of a size to pass through said slots when turned to a given position, a pin rigidly carried by said knob to engage said notches, and means for connecting said knob with said boss, said means including a spring acting t resiliently hold the knob against said boss.

6. In a lock of the character described, a keeper plate having a boss extending therefrom provided with a plurality of notches, a locking plate having an opening 'for receiving said boss, a knob mounted on said boss formed with means capable of movement over said locking plate for holding the'same against the keeper plate, said boss having a pin adapted to project at different times into saidnotches and a bore extending fromthe "outerpart to a position near said boss, a pin carried by saidkeeper plate extendinginto said bore, said pin having an enlarged head in said bore, and a spring arranged in said bore acting on said head and part of the knob wherebyithe knob is resiliently held against said boss. 7

JAMES EDI/VIN PHILLIPS. 

